There's an instant party in our tie-dye packs! Just add your own t-shirts, or ask guests to bring their own. T-shirts are dry and ready-to-wear in about half an hour. Permanent and machine washable after three days. No heat needed, and hands wash clean with mild soap and water. Non-toxic, non-flammable, no fumes (can be used safely indoors), and safe for enjoyment by kids aged 5+ under adult supervision.